Micrometer calipers



LOUIS FLACIECSKAIVIPF, LOST CREEK #2, PENNSYLVANIA.

MIGROMETER CALIIPEBS.

Specification cf Lett'ers Patent.

Patented June 13, 1922.

Application filed December 26, 1918. Seria1 N0. 268,338.

T0 all wh'om dzf may conoern:

Be it known that I, LOUIS LACHSKAMPF, a citizen of ehe nicecl Stabes, residing in Lost Creek #2, Pennsylvania, have inventecl the Micromcterv Calipers, 0f which the following is a specification.

One object 0f this invention is to providemicrometer calipers especially clesigncd am]. constructecl to permit ofmaking both-insicle 2L11Cl outsicle 1heasurements With a high degrec Qf accuracy betweenmelatively. wide limits';the invention ycontemplating the rovision 0:E certain conveniently interchangealole parts formecl 130 cooperate witl1 each other und Wih a single fmme where. such measurements may be made=w1th.

l0y the requirecl accuracy at any point orbetween any limits betweenthe extreme limits 01 thc range 0I" the instrument.

I further clcsire t0 piovicle a novel fotm of microm'cter heacl aclaptccl f or -coaction witl1 the frame and Witl1 any of a number oi:' anvil- 01 chuck rocls, for makiflg inside und outsicle measurements With the utmost precision.

Tl1e invention also contemplates a novel form of cl1uck rod purticularly 2idaptecl for usc with a micrometerhead 130 provide a convenient instrument i0r use in- Inaking uccurate inside measurements und also amilablc for combination with the fraine, anvil rocl ancl microrncter l1ead in making ;tinsicle measurements cf relativcly larger cliameters,

Another object of my invention'is to provicle a novel form 0f anvil 'rocl particularlyaclaptecl f01' use wit l1 a caliper framc ancl a micrometer heacl f01' making' b0tl1 insic'lc und outsiclc measuremcnts with a l1igl1 cle gree 01 accuracy, tl1c invention inclucling such an arrangement of parts as Will pcrmit cf thc use of any one 'of a sct 01 gauge roclS for adjusting thc calipers f01 use in Inaking accuratc measurements between Wi(lc limitsl I further' clesi1e- 130 provicle an instru1'nerit' of tl1e clmractcr above noted Wl1ereby amicron'1eter l1eacl o;f relatively limitecl range' may be* utilized in making accurate measurements both of'inside and 0L1tside diameters, between limits mimy times in ex cess 0f such range tl1econs trucfiion being simple, Substantil and 0fsuch ahature as 130 permit 0f the convenient und rapid adjustment of the various p arts.

These objects and other advantageous ends I attain as hereinafter sei: forth, reference being had to the accompanying clrawings, in which,

Fig. 1 is a sicle elevation illustrating a micrometer caliperconstructecl in accorda nce With my invention;

Fig. 2 is a side clevationlof art of the calipe1 frame showing 0116 of the anvil chuck rocls in osition therein;

Fig. 3 is a fragmentary side eleviation similar to Fig. 2, showing fian 2Lnvil rod With itscooperating cl1uck rod;

Fig. 4 is a vertical section on the line 4-4, Fig. l;

Figs. 5.130 8inclu'sive afe Sid elevations illustrating variouS forrris of alle anvil rods" forming parts of my invention;

Fig. 9 is ztsicle elevation showii1ga double chgck rod ahd one of it's C00Pemting anvil r0 s;

Fig. 10 shows mymicrometer hecl combined.with acl1uck rod to form an inside micrometer guage;

Figs. 11 ancl 12 are side elevations of gauge rods f01 use with the other parts of my invention; ancl Fig. 13 is a side elevation 0f an extension sleeve Which may be employed :Eor quickly changing the acljustmentcf the calipers.

Referring 150 the above dravvings, 1 represents a relatively rigid frame cf U-shapeol 01 substantially semi-circular form, proviclecl with vulcanized fibre sicle places 1= und havirig the extremities cf its arms constructed 150 constitute tuloular clamps 2 und 3, f0rwhich purpose tl1ey aic split in Or parallel with the plane of thc frzune and are each provided with a tightening holt 4. One of these clamps 2 is clesignecl to reccive the cylindrical body po1tti01i of miciometer feacl 5 Wl1ich is 0f sucha*clian1eter as 130 Closcly fit into it when the clamping nut 4 is in a released position, tl1cre being ab one encl 01 said cyli1idrical ortion a kni1rled Hnge 01 Collai 6'f01 limiting ancl deterniining ehe Position Cf tlie micrometcr head inthe franie.

The rotary barrel 7 of' the micrometer head has fixed t0 it a, fiat ended rod 01' anvil 8 Which extends through tl1e body so asto project betw'en the arms 0f the frame 1', und this barre l is peculiar in having its outer end formed t0 provide a second anvil 9 for use in making inside measurements. That end of the barre1 7 adjacent the collar 6 i s bevelld &Ild circumferentially graduated in the customary 1 ua n usr, as is also that stationary pz11fi o1 the cylindrical body whieh projects into said bar1el.

F01 coaction wiuh ohe .micrometer head 5 I provide 21 number 01 separate anvils and anvil extensions, 01: Which 21 simple forn1 is illustrated in Fig. la's consisting of an elongaised cyli'ndnioalrod10having 1ts inne1 en d 11 of reduced d'1ameter and pmv1ded with a flat Terminal face aocurately forn1ed at right ang1es to its een terline.v The diameter o1 this'anvil 1od is s11ch that it Will olosely fit into the clamp 3 of the frame und may oe g1ipped t1'1e1eby in any adjusted osition by setting up on the holt 1. It s opposite end 12 is u1so 01 reduced diameterand while termi- 11z1t111g 111 21 H Center 1ine, has seid fa c'e of'considerably 1ess area than the face 011 the opposite end, in order that it may be adapted :Eor making inside measurements.

\/Vith ehe above described arrange1hent 0'f parts, if it be assumed that he micrometer head h2'1s an extreme range of one inch and is '*gr21d1121ted to indicate thousandths 01 an holt 4: of the 01211np 8 inch, the calipers .may be set to make measurements of d1an1eters between two and -three inches 1301 exmple, by 21dj11'sting the hea'd et zero, and

barrel '01 said mierometer y} then plaoing between 1ts n1ovable anvil 1'0d 8 und theend ofuhe 21I1v11 rod 10, 21 gauge 1'0d 30 hav1ng 21 length of tWo inches, the

being set up 110 grip seid 10d 10 when the ends of the gauge rod conczxct W1oh its end z1nd Withche end 01 the anvi1rod 8 of the micrometer. Since the dis tanoe between the rode 8 and 10 is now two inohes, the ba1 re1 7 n121y be tu1ned o1 baoked ofl:' to fiermit of the measurement 015 diameters' between two and three inches und such 1neasurements may be made With accuracy to lass than 21 thousandth of an inch.

It is payticularly to be noted thz1t the anvil 1"0d 10 is 2'1ccurately 1nade 01 a definite 1ength,

- preferably of an e1fen number 01 inches, so

that when the instrument is sei; as above 111- dieated, 110i; on1y are the adjacent ends of the rods 8 and 10 21t 21 definite distance apart but the ou ter extremities o1 the barrel 7 and of the rod 10 likewise a1e separzpted by 21 defi nite known distanoe.

The instrument 1nay theri be sed to malte inside measure1nerits 1oy adjusting the ba1rel 7f unti1 the anvils or po'1nts 9 and 12 both contact with the tw0 surfaces between which the distance 1s to be determined, a11d seid distance may then be asoertainedby addiixg the microineter reading to the known length overall of the microrneter headwh n its two' zero graduationscoineide and adding to this, th e length of the gauge pieee 80 er 30, etc.,

'When it; desiredto u'se; the instfumeno sole1y 1.01 outsid mea urements I may 9.1111t im he; 01211 111 3. an anvi 'md such 'as t face a1; 'right angles 10 its that indica'ted ab 18, Fig. 7, having but one end 11 'forrned 130 coact with the rod 8. 01 the 1niorometer head. Obiviously I may provide several of these anvil rods of diiferent lengths and utilize them in making inside as we11 as outside measurements by mounting 011 their outer 01 rounded ends 14.21 01111011: 1od 15 (Fig.3). The lafcter is so constructed es to provide atjone end a chuok 27 formed to fit upon and gr'1p the anvil rod 13, Wh'1le 1ts outer end has it's extremity 12 formed to coact with the anvi1 9 of the 1nioromeaer hez1d 111 making inside measnrements. It is to be noted ahmt the dia1neters 015 the body 01 the anvil rod 13 and of that part of the m1- crometer heed Whieh fits in the olamp 2 are identical, so that' 11' it b desired t-o provide 21 relatively narrow range instrument f01 maki11g inside measurements, the hez1d 51nay be ren1oved fromthe frzune 1 and inserted in the chuck 27 of the e'huokrod 15 es indicated in Fig. 10. The anv1l 9 and the enf1 12 01 seid chuck rod may then obviously be used in the Well known 1nanner to 1nake 1nside nieasurementsby proper manipulatiOnof the micrometer barrel.

has 21 body portion 17 fitting the c1zunp 3 a11d its end 11 is formed to ooopemte with ehe anvi1 rod 8 of the micrometer when 1h is desi'red 130 mak e ou tside measure1n'e1its;ib

being possiflole to set this rod in the olamp by means of any of anumber of gauge rods such as those indicated 111 Figs. 11 and 12, so as to use ehe instrument to measure any diametters up 130 the 11111 internalcapaoity of the fm1ne1.- 'l his anvil rod 16 outside of its body portion 17 Which may be gr ippedby the clz1nip is 01 reduci d diameter es indicated et 18 end ter1ninates in a chuck 19 Jfo1 the recepion 013 an anvil head 20, Fig. 8. The 1at ter has an anvi1 point 12 designed to cooperat With the point 9 o1 the 1111010111- eter head in making inside measurernents.

The capacity of the instrument 'f01 1neasuring inside dimneters 1nay be.increased by p1'011f11I1g011e o1- any desired i1urnber of extension anvi1 rode o1? the form show1i at 21 in Fig. 6 eaeh of which has a portion 22 designed to fit 111to andbe grippedby the ehu ck 19, z 1nd alsohas 21 body 23 of any desired definite 1ength te9rr'ninating 111 a point 12, forriwd to coopera'te with the anvi1 9 013 the mior'ometer head as befoie descr"ibed in making inside measurements. In F ig-. 5 I have illustrated '21 forma of extension anvil whioh is relatively heavienthen that of-Fig; 6 b111; 1s functionz1lly the same and isdesigned for the measurement of greater lengths stead of the one knurled portion 28 as in the ceseo1? the rod 21, to pe1111ifidfits bei-11 coi1veniently grasped and he1d during the manipulations ofthe chuck 19.

F01 certain intermediate inside measurements I may mount one of the anvil rods 10 0r 13 in th e clamp 3 0f the frzune and apply t0 it a double chuck r0d 29 (Fig. 9) hav1ng at one end a, chuck 27 designed t0 fit 011 and grip the outer end 0f eithe1 0f said anvil rods. The 0ther end 0f this chuck r0d has a second.and smaller chuck 19 designed 110 receive the anvi1 head 20 01 any 0ne 0f a series of anvil rods such as those showp in Figs. 5 and 6, depending up011 the diameters t0 be measured.

In any 02156 it is 130 be noted that after the micrometer head 5 has been gripped in the clamp 2 0f the frame Wiith its fiange 6 in contact with the sam, the instrument may be set t0 measure outside diameters by mounting 2u1vil rode such as 10, 13 01 17 in the clamp 3 and setting them at the desired distance from the anvi1 rod 8 by the use 0f' the appropriate 0110 of the gauge rods 80, 80 of which there may be any desired number differing from each other in length by a const-ant amountfor example one inch. Such setting likewise adjusts the instrument f0r inside measurements since the anvi1 and chuck rods, et0., are preferably 0f definite known lengths, as :ue also the structures formed by c0mbining any 0f the anvi1 rods with any of the chuck rods, it being necessary 0f corse 150 n1ove the rod as far as possib1e into the chuck.

If it be desired t0 quickly increase the range of the instrument for inside measurements by the unit amount. 1' e. 0110 inch, when a chuck r0d such as those 0f Figs. 2

01 9 are in p1ace-in the fra1ne, I 1nay loosen the chuck 19, and after removing the anvil head o r r0d 20 01 21 as the case may be, place 011 the chuck engaging end 015 the latter a sleeve 31 (Fig; 13) having a length 0f one inch, so that said s1eeve engages both a shoulder on the anvil and seid chuck, and reinsert said end in the chuok. I/Vhile the end 22 may then be gripped by setting up the chuck, the overa1l length of the chuck and anvi1 rods has been increased by one inch as desired.

From the above description it will be noted that I may conveniently set and use the instrument f01' both inside and outside measurements and quickly adjust it f01' accurate operation between any desired limits within a relatively great range.

I c1aim:

l. The combination 0f a substantiully U-shaped frame; a micrometer mounted 0n 0110 brauch of-saidframe; an anvi1 10d mounted 0n the second branch 0f the frame; a doubl0 chuck rod mounted 0n the outer end of said anvilrod; and a second anvi1 r0d suppo1ted by the chuck r0d in position 150 cooperate Wih the micrometer in making inside measurements.

2. The combination 01 a U-shaped frame; a micrometer carried by one branch 0'f said frame; an anvi1rod carried by a second branch 01 the frame and having a chuck ad: 0110 end; a second anvil 10d removably mounted in the chuck and having a shoulder formed t0 normally abut thereon; with an extension sleeve adapted to fit 0n the anvil 10d between the shoulder thereof and the chuck.

In witness whereof I afi3x my signature.

LOUIS FLACHSKAMPF. 

